# Price / Quantity Calculator (Which Is the Better Deal?)

URL: https://speedycalculator.com/calculators/finance/price-quantity/
Last updated: 2026-10-25

> The price/quantity calculator compares two package sizes – price per unit of a smaller and a larger product – to show which is cheaper and how much you would save by buying the better deal.

## Inputs

- Smaller product – quantity
- Smaller product – price
- Larger product – quantity
- Larger product – price

## Results

- Smaller product – price per unit
- Larger product – price per unit
- Better deal
- The larger quantity would have cost at the smaller product's price
- You save buying the larger product
- Saving per unit

## Formula

```
Price per unit = price ÷ quantity
Saving = (higher unit price − lower unit price) × quantity bought
```

## Explanation

Bigger packs are usually cheaper per unit, but not always – promotions on small sizes often beat bulk packs. Comparing the unit price is the only reliable way to know.

### How to use the Price / Quantity Calculator

- **Smaller product – quantity**
- **Smaller product – price**
- **Larger product – quantity**
- **Larger product – price**

Results update as you type, and every field accepts the units shown in its menu.

### How it works

Enter the quantity and price of the smaller and the larger product.

### Tips

- Use figures for the same period (a month, a quarter or a year) for every input so ratios compare like with like.
- Track the metric over time – the trend usually tells you more than a single value.
- Compare your result with industry benchmarks, which vary a lot between sectors.
- Treat the result as a starting point for a decision, then check the assumptions behind each input.

### Common mistakes to avoid

- Mixing monthly and yearly numbers in the same calculation.
- Using revenue where the formula needs profit (or the other way round).
- Forgetting hidden costs such as taxes, fees, overheads or your own time.

### Inputs explained

FieldWhat to enterSmaller product – quantityA numberSmaller product – priceAmount in your currencyLarger product – quantityA numberLarger product – priceAmount in your currency

### What each result means

- **Smaller product – price per unit** = [Smaller product – price]÷[Smaller product – quantity]
- **Larger product – price per unit** = [Larger product – price]÷[Larger product – quantity]
- **The larger quantity would have cost at the smaller product's price** = [Smaller product – price per unit]×[Larger product – quantity]
- **You save buying the larger product** = [Smaller product – price per unit]×[Larger product – quantity] - [Larger product – price]
- **Saving per unit** = (1 - [Larger product – price per unit]÷[Smaller product – price per unit])×100

## Worked example

Inputs — Smaller product – quantity: 500; Smaller product – price: $3.49; Larger product – quantity: 1,200; Larger product – price: $7.99.

Results — Smaller product – price per unit = $0.00698; Larger product – price per unit = $0.00666; **Better deal = Larger product**; The larger quantity would have cost at the smaller product's price = $8.38; You save buying the larger product = $0.39; Saving per unit = 4.61 %.

## FAQ

**Is bigger always cheaper?**
No – check the unit price, especially when smaller sizes are on sale.

**How do I compare different units?**
Convert both to the same unit (e.g. grams or ounces) first.

**Should I always buy the cheaper unit price?**
Only if you will use it all before it spoils.

**What formula does the Price / Quantity Calculator use?**
Price per unit = price ÷ quantity.